A344273 - OEIS

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A344273 as a simple table

n	a(n)
1	1
2	6
3	24
4	80
5	273
6	960
7	3336
8	11480
9	39648
10	136952
11	472416
12	1630164
13	5625480
14	19412736
15	66992016
16	231184800
17	797806152
18	2753187210
19	9501109380
20	32787848746

[1,6,24,80,273,960,3336,11480,39648,136952,472416, 1630164,5625480,19412736,66992016,231184800, 797806152,2753187210,9501109380,32787848746]